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It is known as the Blue Snowball Nebula, Snowball Nebula, and Caldwell 22. This nebula was discovered October 6, 1784 by the German-born English astronomer William Herschel . In the New General Catalogue it is described as a "magnificent planetary or annular nebula, very bright, pretty small in angular size , round, blue, variable nucleus".
Blue Snowball: Planetary Nebula: 3.2 Andromeda: 9 C23 NGC 891: Silver Sliver Galaxy: Spiral Galaxy: 31,000 Andromeda: 10 C24 NGC 1275: Perseus A: Supergiant Elliptical Galaxy: 230,000 Perseus: 11.6 C25 NGC 2419 Globular Cluster: 275 Lynx: 10.4 C26 NGC 4244 Spiral Galaxy: 10,000 Canes Venatici: 10.2 C27 NGC 6888: Crescent Nebula: Nebula: 4.7 ...
NGC 6781, also known as the Snowglobe Nebula, [5] is a planetary nebula located in the equatorial constellation of Aquila, about 2.5° east-northeast of the 5th magnitude star 19 Aquilae. [3] It was discovered July 30, 1788 by the Anglo-German astronomer William Herschel. [6] The nebula lies at a distance of 1,500 ly from the Sun. [2]
This page was last edited on 29 December 2024, at 03:24 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Radar is used to measure the distance between the orbits of the Earth and of a second body. From that measurement and the ratio of the two orbit sizes, the size of Earth's orbit is calculated. The Earth's orbit is known with an absolute precision of a few meters and a relative precision of a few parts in 100 billion (1 × 10 −11).
Lying approximately 3 degrees southwest of Iota Andromedae at a distance of about 4,000 light-years from Earth, the "Blue Snowball Nebula" [11] is a popular target for amateur astronomers. [66] It earned its popular name because it appears as a faint, round, blue-green object in a telescope, with an overall magnitude of 9.2.
The actual temperature and distance for the snow line of water ice depend on the physical model used to calculate it and on the theoretical solar nebula model: this tells us nothing for the temperature in degrees 170 K at 2.7 AU (Hayashi, 1981) [4] 143 K at 3.2 AU to 150 K at 3 AU (Podolak and Zucker, 2010) [5] 3.1 AU (Martin and Livio, 2012) [6]
The site was listed on the National Register of Historic Places in 1976 and the Columbus Register of Historic Properties in 1982; the district boundaries differ between the two entries. [ 1 ] [ 2 ] The Snowden-Gray House , a High Victorian -style two-and-a-half-story mansion with a cupola , built in 1852, is salient in the district.
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